Differences Between Zr2s and Regular 4x4 2 Door Blazers
Notice the different colored text in the quote by El_Beautor below. 
The ZR2 rear axle is wider too, and its a 8.5" rear vs the 7.5" of normal S-series trucks. The frame is different too, in that the suspension mounts lower, and some of the cross members are slightly different. Quick search finds this thread that discusses the differences pretty good.




